Permalink Submitted by William Tuttle on Thu, 2017-10-19 00:33
You can not have a 5305 SEP IRA plan and any qualfied plan (including a DB plan) in the same year.
I believe you can have a prototype SEP IRA plan that specifically coexists with a DB plan. I have no knowledge where you would find such a plan.
If you were able to obtain such a plan, the DB/SEP IRA combined contribtution would be limited to 31%, unless the DB plan is subject to the PBGC. In that case the SEP IRA contribution would be limited to 6%.
You would be much better off with combining a one-participant 401k and a DB plan. You would be able to make an employee deferral of $18K + $6K catchup >= age 50, + the above.
Permalink Submitted by William Tuttle on Thu, 2017-10-19 00:33